At an unspecified time during the war, Karath was promoted to Admiral of the Sith Navy and as such was given command of his own Interdictor-class ship, the Leviathan. Karath intercepted the Ebon Hawk and interrogated the crew which included the redeemed Revan, Bastila Shan and his former protege Carth Onasi.

The three escaped confinement and assaulted the bridge of the Leviathan, forcing a confrontation between former protege and mentor. Karath was mortally wounded in the battle, and with his dying breath revealed to Carth the true identity of his comrade Revan, who was none other than the former Dark Lord of the Sith.